Shape 1-1/2 lbs. of ground chuck into eight 3-oz. portions on waxed paper. Press each portion into a 4-in. patty using a fork.
Top four of the patties with an onion slice and shredded cheese. Cover with remaining patties, using waxed paper to help position the patty on top.
Seal edges with a fork. Grill to desired doneness.
Grill to desired doneness. Stuffed burgers grill up great over medium heat. This lets the filling heat through without the outside becoming overcooked.
More good stuff:
- Try Swiss cheese in ground turkey burgers
- Add crumbled bacon with your favorite cheese
- Surprise them with a pineapple slice inside
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